Fuel-pump for internal-combustion engines.



0. F. PERSSON. FUEL PUMP FOR INTERNAL COMBUSTION ENGINES.

APPLIOATION FILED MAY 1,1912.

Patented Nov. 24, 1914.

F igJ.

- Inventor: Otto F. Persson,

0. F. PBRSSON.

- FUEL PUMP FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED MAY 1. 1912.

1,118,796. Patented Nov. 24, 1914.

Z SHEETS-SHEET 2.

57 m I l 32. 55 56 27 56 ltnesses: 2s lfiventor". Otto F peersson.

flif 1 W UNITED STATES PATENT OFFICE.

OTTO F. PERSSON, 0F ERIE, PENNSYLVANIA, ASSIGNOR TO GENERAL, ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

FUEL-PUMP FOR INTERNAL-COMBUSTION ENGINES.

Speciflcation of Letters Patent.

Patented Nov. 24, 1914..

g has for its'object to improve their construction and operation whereby they are made exceedingly sensitive to the control of a speed governor driven by the engine.

For a consideration of what I believe to be novel and my invention, attentionis directed to the following description and claims ap-' pending thereto.

In the accompanying drawings, which are illustrative of my'invention, Figure 1 is a view in side elevation of an internal combustion engine showing the pump mounted in position; Fig. 2 is a plan view of the pump; Fig. 3 is a longitudinal section of the pump; Fig. 4 is "an enlarged sectional view taken on hne 4- -4 of Fi 2', and Fig. 5 is a plan view of a slight mo 'fication.

Referring to Fig. 1,1 indicates the base of an internal combustion engine having as many cylinders 2 as are desired. In the present instance the engine has four cylinders, and is of the constant pressure type.

3 indicateslthe main shaftand mounted thereon is a worm 4 that meshes with a worm wheel 5, the lattere being mounted on the lower end of the gov rnor shaft 6. The

upper end of the shaft drives a speed governor 7 of any suitable construction which is arranged to move the collar 8 up and down as the speed of the engine changes. This collar transmits its movement to the governor lever 9 and the latter controls the pump as .will appear later. Mounted on the governor shaft is a worm 10 that drives the worm wheel. 11, the latter being mounted upon the cam shaft 12, whose cams control ,the various valves of the engine. On the end of the cam shaft is mounted an eccentric 13 which is surrounded by a strap that is connected to the eccentric red li for. actuatin the pumps.

eferring more especially *to 3, 15

indicates a fuel tank th'atisacarri by one of the en ine cylindersfopother; suitable part. Sai ,tank-containingfuel-such as oil,

the supply pipe 19. The tank is provided with as many plungers 20 as there are cylinders t0 the engine. Since each of these pumps 1s of the same construction, a description of one of them will be sufficient. Surrounding the plunger is a sleeve or lining 21, which is made long to prevent the escape of fuel around it. The upper end of the plunger is provided with a cap 22, which is engaged by the head of a screw 23 when the latter is depressed. This screw is made adjustable for the purpose of insuring the proper operation of the plungers. The said screw is carried by a cross-head 24 and the latter is provided with a pair of lugs 25 between which is located the lower end of the eccentric rod 14. The rod and cross-head are connected by the pin 26. Situated underneath each plunger is a plate 27, and under the plate is a coiled compression spring 28, which tends at all times to raise the plunger against the action of the eccentric provided with a stem 30 located in the sleeve- 31 and projecting above the end thereof. Situated, underneath the valve is a coiled compression spring 32 that tends at all times to seat the valve. As the plunger 20 moves upward the suction created thereby causes the valve 29 to open, and fuel to flow from the oil chamber through the passages 33. p

35 indicatesthe discharge valve which is normally held against its seat by the s ring 36. The fuel discharged by the val ve is conveyed by the pipe 37 to one of the fuel discharging devices mounted in the engine cylinder.

The structure of the pump thus far described is not claimed herein because it forms no part of my present invention.

In an apparatus of this character it is necessary toregulate the amount of oil discharged by the pumps in accordance with tionmust be accurate within relatively ernal-l limits if the best results are to be -..0btn.ined." Owing to the fact that the. pump gore are being constantly moved back P an orth with a constant length of stroke,

' The screw must be out it follows that unless some means are provided to regulate the pump that it would always deliver the same amount of fuel. control the pump by placing its suction valve under the control of the speed governor by means of a novel mechanism. Mounted on the pump cross-head 24 is an arm 38 which is connected by link 39 to the lever 40. This lever is constantly vibrating on its pivot 41 because of the connection to the cross-head.

42 indicates a pivot that is carried by brackets 43 cast on one side of the pump casing. On the pivot 42 is loosely mounted a sleeve 44 that carries an arm 45 having an adjusting screw. 46. This screw should have a double or triple thread so that a small angular movement thereof will cause a relatively large axial movement. On the end of the screw is an arm 47 which is connected to the speed governor by the connecting rod 48, the latter being provided. with adjustable heads 49. On the sleeve 44'are also mounted arms 50, each of which is provided with an adjusting screw 51 that is normally fixed in position. That is to say, the screws are adjusted once for all. The arms 45 and 50 are .mechanically united by their supporting sleeve 44 and form a rocker whose efiective movement is determined by the speed governor. It is evident that as the lever 40 is vibrated in synchronism with the crosshead 24 that once every stroke its rounded end 52 will strike the top of the adjusting screw '46 and depress the arm 45 by an amount depending upon the position of the screw in said arm. That is to say when the screw is in one of its inner positions the downward movement of the arm 45 will take place later with respect to the lever 40 and pump plunger than when it is in one of its outer positions because the lost motion will be greater. As the arm 45 v is depressed it imparts corresponding movements to the arms 50. As these arms are depressed the adjusting screws 51 in the ends thereof engage the stems t ll of the suction valves and force them off of their seats. The portion of the plunger stroke that each suction valve is held of of its seat is therefore determined by the position of the adjusting screw. 46 and the speed governor. a type capable of moving rapidly through the arm 45 because of the relatively limited range of movement of the governor lever.

In Fig. 5 I have shown a slight modification of my invention wherein a rocker 53 is provided that is attached to one end of the vibrating lever 40 instead of being separately pivoted. In this rocker are as many quick acting screws 54 as there are suction valves. These screws correspond in character to the screw 46, best shown in Fig. 4. Each screw'is connected to an arm 55, and

plurality of cylinders,

. cylinder,

the several arms are united by a rod 56, so

as to have simultaneous movement. he governor actuated rod 48 is connected to the screw actuators as .for eizample .by the arm 57.

T have shown the rocker arranged to hold the suction valves off of their seats for 'certain portions of the plunger strokes, but it is to be understood tha}; other valves-of the pumps may be so controlled.

The adjusting screws as shown are actuated by a speed governor but for certain conditions of service the screws may be operated by other forms of controlling means.

In accordance with the provisions 0 patent statutes, 1 have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; but I desire to have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by other means.

What I claim as new and desire to secure by Letters Patent of the United States, is:

1. In a fuel pump, the combination of a plungers therefor, means for actuating the plungers in unison, valves for each cylinder, means vibrating in synchronism with the plungers, governing means, means common to a number of said valves, for actuating them, and means interposedbetween the vibrating and actuating means and carried by one of them which is adjusted by the governing means for controlling the portion of the plunger strokes that said valves are held oil of their seats.

2. In a fuel pump, the combination of a plurality of cylinders, plungers therefor, means for actuating the plungers in unison, valves for each cylinder, means vibrating in syp chrgnipgllvith the plungers, a governing means, means 0mm a number of valves for actuating them and means between the vibrating and actuating means which is in screw-threaded engagement with one of them and is adjusted by the governing means for determining the portion of the plungerstrokes that the valves are held ofi of their seats.

3. In a fuel pump, the combination of a a plunger therefor, means for actuating the plunger, a suction and a discharge valve for the cylinder, a lever vibrating m f the synchronism with the plun er',-a rocker, a

multi-threaded screw. carrie by the rocker that acts to hold the suction valve ofi of its seat, and a speed governor that is connected to the screw for turning it. i

4. In a fuel pum the combination of 'a g.

plurality of cylin ers, plungers therefor, means for actuating the plungers in unison, valves for the cylinders, a lever vibrating'in synchronism with the plungers, rocker having arms certain of which act on valves, w

rocker er nsand aotediu on sorew.=.

from the former tothe latter, and

means to change. the position of t e motion an 'adjustahle gel-wetsuits b :oneofi-the thelever,

and; yiontrollingQ means or "a 5': my -fuel t m as combination bi a,

plureliiy. oi 'cylm ers, plungers therefor,

means or actuating said lungers in unison, SIICtlOIl and discharge va ves, stems for the v r suction valves, a'lrocker having arms that '10 are arranged to engage sa d stems, a vibratmg lever thatmoves with the-plungers and is ada ted to move the rocker means interposed etween the lever andt .e rocker and carried by one of them to transmit motion transmitting means.

6. In a fuel pump, the combination of a usting the to vary the overning oylinder, a pluner thereioi a suction aniia dischargevalve or the cyl nder, a lever that is vibrated with actuating oneof said valves that is moved by.

the lever through lost-moti0n,1amultithreaded screw through which the movement of thelever istransmitt-ed to the rocker, and,

a means mounted on thescrew for turning, it ortion of the plunger'stroke that said .va ve is kept off ts seat by the rocker.

In witness. whereof, I have hereunto set the plunger, a rocker for 

